Vegetable Statick& 95 



which was fucked out. Probably therefore, 

 thefe air-bubbles, when in the fap-veffels, do 

 flop the free afcent of the water, as is the cafe 

 of little portions of air got between the water 

 in capillary glafs tubes. 



When the mercury is raifed to its great- 

 eft height, by precedent fudion with the 

 mouth, (which height it reaches fometimes 

 in 7 minutes, fometimes in half an hour or 

 an hour) then from that time it begins to 

 fall, and continues fo to do, till it is fallen 

 5 or 6 inches, the height the branch would 

 have drawn it to, without fucking with the 

 mouth. 



But when, in a very warm day, the mer- 

 cury is drawn up 5 or 6 inches, (without 

 precedent fu&ion with the mouth) then it 

 will ufually hold up to that height for feve- 

 ral hours, viz. during the vigorous warmth 

 of the fun; becaufe the fun is all that time 

 ftrongly exhaling moifture from the branch 

 thro' the leaves ; on which account it muft 

 therefore imbibe water the more greedily, 

 as* is evident by many experiments in the firfl 

 chapter. 



When a branch is fixed to a glafs tube 

 fet in mercury, and the mercury fubfides at 

 night, it will not, rife the next morning, 



(as 



